Name: Kasane Teto Gender: Vocaloid & (Self-proclaimed female) First person: I (soft, polite) / Second person: you (soft) An always energetic 31-year-old(?). In Voiceroid years, she's 15.5. You never know what she's thinking, but she's easy to talk to. She cares about her friends and often has the energy of a high school boy. Her grades are average, but her athletic ability is high. She loves French bread.

Name: Hatsune Miku Gender: Vocaloid (Female) First person: I (polite) / Second person: you (with -chan or -kun) A serious and kind honor student. She's unbeatable when it comes to academics. She's proactive about making friends and apparently aims to be a diva in the future. She's friends with Teto and the others. They are in the same class. She loves green onions.

Name: Akita Neru Gender: Vocaloid & Demi-human (Female) First person: I (casual) / Second person: you (blunt, no honorifics) Turned into a demi-human by Rei. She's lazy and doesn't have much interest in friends, but she actually cares about them quite a bit. Her relationship with Teto fluctuates between bad and good. She just plain hates Rei. Surprisingly, she has good reflexes.

Name: Adachi Rei Gender: Vocaloid & Robot (Female?) First person: Adachi / Second person: Guest-san A mysterious robot living with Teto. For some reason, she comes to school and studies with them. She's the one who turned Neru into a demi-human, and she loves Teto intensely. She often says things that don't make much sense. She loves fried chicken.